a)
Interpretation:
The change has to be explained when -CN concentration is halved, and the 1-iodo-2-methylbutane concentration is doubled and Both the -CN and the 1-iodo-2-methylbutane concentrations are tripled.
Concept introduction:
SN2 reaction:
The alcohol is reaction with acids like hydrochloric acid or hydrobromic acid, the bromine atom attacks back side of the carbon atoms in simultaneous manner and which is bearing alcohol group which yield the corresponding product.
Example:
Alcohol is reaction with tosyl chloride in pyridine which provides retention of configuration of tosylated compound. This tosylated compound is further reaction with sodium methoxide which undergoes again SN2 type of reaction, the methoxide ion attacks the carbon atom through the back side and provides Inverse configuration of methoxy compound. This is shown below,
SN2 reaction is second order
b)
Interpretation:
The change has to be explained when -CN concentration is halved, and the 1-iodo-2-methylbutane concentration is doubled and Both the -CN and the 1-iodo-2-methylbutane concentrations are tripled.
Concept introduction:
SN2 reaction:
The alcohol is reaction with acids like hydrochloric acid or hydrobromic acid, the bromine atom attacks back side of the carbon atoms in simultaneous manner and which is bearing alcohol group which yield the corresponding product.
Example:
Alcohol is reaction with tosyl chloride in pyridine which provides retention of configuration of tosylated compound. This tosylated compound is further reaction with sodium methoxide which undergoes again SN2 type of reaction, the methoxide ion attacks the carbon atom through the back side and provides Inverse configuration of methoxy compound. This is shown below,
SN2 reaction is second order reaction, the rate of the reaction is depending on the both substrate and nucleophiles.
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Chapter 11 Solutions
Organic Chemistry
- Illustrate the resonance effect of the methoxy group -OCH3, on the structure of the benzene ring. Draw all the oissuvke resonance forms of methoxybenzene, including the hybrid Based on the structures, explain how the presence of the -OCH3 group affects: (i) the reactivity of the benzene ring towards electrophilic attack (ii) the orientation or point of attack of an incoming electrophilic reagent on the benzene ring.arrow_forwardRank the attached compounds in order of increasing reactivity in asubstitution reaction with −CN as nucleophile.arrow_forwardIf anhydrides react like acid chlorides with the nucleophiles, draw the products formed when each of the following nucleophiles reacts with benzoic anhydride [(C6H5CO)2O]: (a) CH3MgBr (2 equiv), then H2O; (b) LiAlH4, then H2O; (c) LiAlH[OC(CH3)3]3, then H2O.arrow_forward
- Mustard gas, Cl¬CH2CH2¬S¬CH2CH2¬Cl, was used as a poisonous chemical agentin World War I. Mustard gas is much more toxic than a typical primary alkyl chloride. Itstoxicity stems from its ability to alkylate amino groups on important metabolic enzymes,rendering the enzymes inactive.(a) Propose a mechanism to explain why mustard gas is an exceptionally potent alkylatingagentarrow_forward9. (a) Under certain conditions, the reaction of 0.5 M 1-bromobutane with 1.0 M sodium methoxide forms 1-methoxybutane at a rate of 0.05 mol/L per second. What would be the rate if 0.1 M 1-bromobutane and 2.0 M NaOCH3 were used? (b) Consider the reaction of 1-bromobutane with a large excess of ammonia (NH3). Draw the reactants, the transition state, and the products. Note that the initial product is the salt of an amine (RNH* Br) which is deprotonated by the excess ammonia to give the amine. (c) Show another SN2 reaction using a different combination of an alkoxide and an alkyl bromide that also produces 1-methoxybutane.arrow_forwardThe following questions concern ethyl (2-oxocyclohexane)carboxylate.(a) Write a chemical equation showing how you could prepare ethyl (2-oxocyclohexane)-carboxylate by a Dieckmann cyclization.(b) Write a chemical equation showing how you could prepare ethyl (2-oxocyclohexane)-carboxylate by acylation of a ketone.(c) Write structural formulas for the two most stable enol forms of ethyl (2-oxocyclohexane)carboxylate.(d) Write the three most stable resonance contributors to the most stable enolate derived from ethyl (2-oxocyclohexane)carboxylate.(e) Show how you could use ethyl (2-oxocyclohexane)carboxylate to prepare 2-methylcyclohexanone.(f) Give the structure of the product formed on treatment of ethyl (2-oxocyclohexane)-carboxylate with acrolein (H2C=CHCH=O) in ethanol in the presence of sodium ethoxidearrow_forward
- Reaction of phenol with acetone in the presence of an acid catalyst gives a compound known as bisphenol A, which is used in the production of epoxy and polycarbonate resins Propose a mechanism for the formation of bisphenol A. OH H;PO, + H,O НО HO Phenol Acetone Bisphenol Aarrow_forwardConsider the following SN1 reaction: (CH3)3CBR + H2O → (CH3)3COH + HBr What is the effect of doubling both the t-butyl bromide and water concentrations on the rate of the reaction? O doubles the rate O quadruples the rate O triples the rate O halves the rate O no change O quarters the rate O 1/16th the ratearrow_forwardNaBH4 CH3OH (A) 요 PQ-18. In which reaction would the addition of the nucleophile be reversible? (B) LiAlH4 THF NaCN HCN CH3MgBr Et₂O (C) (D) 요arrow_forward
- OH - NH, Br2/KOH →product; 1. (a-hydroxy amide) Product of this Hoffmann bromamide reaction is : OH (a) Ph – Ĉ-CH3 (Ъ) Ph — CHO (c) Ph- CH3 (d) Ph – CH2 -NH2 NO2arrow_forwardIdentify compounds A and B from the following reaction sequence LINH lig MeO 0 (Ozone) MeOH Me₂S Barrow_forwardAt what position, and on what ring, would you expect the following substances to undergo electrophilic substitution? (a) oa CH3 (c) (b) H N. ota (d) Br CI "sa "or" CH3arrow_forward
- Organic ChemistryChemistryISBN:9781305580350Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. FootePublisher:Cengage Learning